Plants rhizomatous. Stems numerous, 10-60 cm, base trailing, tinged purple-red, densely spreading white hispid or pubescent to subglabrous, internodes much longer than leaves. Petiole 1-3(-5) mm; leaf blade triangular-ovate to lanceolate, 1.2-3.8(-5) × 0.7-1.7(-4) cm, adaxially white ciliate or minutely hispid, abaxially distinctly impressed glandular, sometimes subglabrous, base rounded to shallowly subcordate, margin crenate-serrate, apex obtuse to acute. Verticillasters many flowered, semiglobose, to 3.5 cm in diam. in flower, crowded apically; lower floral leaves slightly longer than calyx, upper ones reduced and bractlike; bracts needlelike, to 9 mm. Calyx ca. 9 mm in flower, glandular, white hispid or puberulent mainly along veins outside, throat white pilose, base slightly swollen on 1 side in fruit; upper teeth narrowly triangular, ± reflexed, apex short aristate; lower teeth triangular, as long as upper teeth, apex long aristate. Corolla rose to purple, 1.5-2 cm, puberulent, throat with 2 rows of hairs; tube exserted, ca. 1.5 mm wide at base, throat to 5 mm. Nutlets obovoid, ca. 1 × 0.9 mm. Fl. Jul-Sep, fr. Aug-Nov.
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